If at all a man is going to be a good husband, soul mate, bestie,  boyfriend and companion, he should understand that the basic stimulus of a woman when it comes to matters of love is and relationship  is fear

Let me break it down:
When a girl is approached by a guy, and wooed, most times she doesn't just fall for the guy outright even if she likes him.
She takes her time to observe, to decipher, to measure up the level of the guy's interest etc...
(but we guys see this as her
giving us tough time) whereas she is just making sure that
1. she doesn't fall for less,
2. that he is not a player,
3. that he is capable of handling a relationship,
4. that she can settle down with him..
This is the first fear, that of making the wrong choice.

Probably the guy goes through storm and cloud prove beyond her imagination that he is just the right person for her, she will still keep her defenses high,  although she might not be snubby and harsh and may totally feel comfortable with the guy to the tune of accepting gifts from him, but she isn't yet biting the idea of an intimate relationship.
You hear her make such comments
as; "lets not rush over this"...."dont you think its too early"?..."lets just be friends"....etc
This is because she doesn't
want the guy to feel as though she was such a cheap catch, so
she hesitates a little.
This is the second fear; that of appearing cheap.

But intertwined in the second fear is the third; that the guy is going to lose interest!
Naturally guys are attracted to a woman's physical beauty. But it takes more than beauty to keep a
man.
At first a guy might be on fire for this girl he saw, he throws in everything to have her, and then discovered; maybe she can't cook, doesn't have manners, she's lacking in hygiene etc. his interest begins to wane.
Normally a girl wants to keep
the man she has attracted. So she gradually gives in, loves him back, loosen her defenses and reciprocate his amorous gestures.
At this stage, she has fallen in love.
And We should be aware that once a girl has fully fallen in love, she never wants out. No girl ever falls in love and hopes to breakup, unlike guys.
So the fear of losing her man makes her compromise many things.
She loses her virginity/sexual corridor to keep him sexually attached to her.
She lies to him about lots of things that could make him dislike her and ruin her relationship.
(in other cases) if she sees her bf as "God fearing" she prefers to have sex with side guys for fear of appearing like a slut before him.😡

Yes, she'll do whatever it takes to keep the relationship.
And in the event of an heartbreak, she never wants to fall in love again.

But again, another promising guy will show up and the process begins afresh till the nuptial knot is tied.

Therefore, the man who understands this cycle of fear and self defence holds the key to a smooth relationship.

N/B This hypothesis is not for dubious applications and it does not also apply to hoes and sluts.